The Affect of Salt Impacted Water on the Expansive Capability of Sodium Bentonite Clay Bench Test Study
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1 The Affect of Salt Impacted Water on the Expansive Capability of Sodium Bentonite Clay Bench Test Study Richard Geier, B.Sc., P.Geol October 19, 2012
2 Richard Geier, B.Sc., P.Geol B. Sc. Geology. U of A Groundwater Engineering Tech, NAIT Environmental Geologist Stantec Consulting Ltd. Edmonton, Alberta Over 7 years of experience Environmental projects include: Site assessment Risk assessment and management Remediation Commercial, industrial, and government properties supervision include: Environmental site assessments Environmental remediation's Remedial design projects Environmental assessment projects in Alberta, British Columbia, and Saskatchewan
3 Introduction Background Initial Study Follow up Study Methodology Results Photos Demonstration Discussion Questions
4 Background Use of sodium bentonite chips to seal of the borehole annulus in groundwater monitoring wells Salt impacted water may retard the seal Bentonite chips may not provide an adequate layer of impermeable material to isolate the well screen Exposed sodium bentonite chips to salt affected water and the expansion was observed
5
6 Initial Study 30 grams of sodium bentonite chips 100 ml of water in jar Varying concentrations of Salt Sodium Bentonite Chips
7 Initial Study Tap Water After 6 Hours Thick putty consistency 4 times original volume Shallow voids visible After 24 Hours Expanded slightly more Voids were not visible No free water remained
8 Initial Study 5,000 mg/l NaCl 0.5 g NaCl/100 ml water After 6 Hours Thick soft paste Double the volume Appeared silty After 24 Hours 2.5 times the volume Same consistency as 6 hours
9 Initial Study 25,000 mg/l NaCl 2.5 g NaCl/100 ml water After 10 Minutes Chips had crumbled Sediment layer at the bottom of the jar After 24 Hours No additional expansion was observed
10 Initial Study 50,000 mg/l NaCl 5.0 g NaCl/100 ml water Within 10 Minutes Bentonite chips had crumbled Sediment layer formed at the bottom of the jar After 24 Hours No additional expansion Gentle shaking the mixture became muddy and settled into segregated layering
11 Initial Study 100,000 mg/l NaCl 10 g NaCl/100 ml water After 150 Days No change was observed in bentonite for all test samples After 24 Hours Chips remained as individual No evidence of bonding or expanding Some crumbling was observed
12 Follow Up Study - Methodology Constructed six model monitoring wells 0.3 m of slotted pipe (1 inch diameter) 0.9 m of solid pipe (1 inch diameter) 0.4 m of 4-8 sand 0.2 m of Sodium bentonite chips (not hydrated) Saturated bentonite using 4 L of water with varying concentrations of NaCl
13 Follow Up Study - Methodology Checked for bentonite layer expansion After seven days, the water: Above the bentonite seal was dyed red Level was increased to 15 cm above the top of the seal Peristaltic pump removed the water and the draw down was measured
14 Follow Up Study - Methodology NaCl (ppm) Na (ppm) Cl (ppm) Conductivity (ms/m) Tap Water n/a n/a ,000 1,967 3, ,000 3,934 6, ,000 9,834 15, ,000 19,669 30, ,000 39,337 60, Conductivity was determined using a YSI probe
15 Follow up Study - Results NaCl (ppm) Time Elapsed (days) Initial Thickness of Bentonite Chips (cm) Final Thickness of Hydrated Seal (cm) % Change in Thickness of Seal Tap Water % 5, % 10, % 25, % 50, % 100, %
16 Follow up Study - Results NaCl (ppm) Initial Water Level (cm) Water Level After Purging (cm) Water Level After 3 Days (cm) Water Level After 7 Days (cm) Water Level After 10 Days (cm) Tap Water , , , , ,
17 Follow up Study - Photos 7 Days After Saturation
18 Follow up Study - Photos Tap Water After 7 Days 5,000 ppm After 7 Days Bentonite thickness increased by 12 cm Bentonite thickness increased by 5 cm
19 Follow up Study - Photos 10,000 After 7 Days 25,000 ppm After 7 Days Bentonite thickness increased by 4 cm Bentonite thickness increased by 3 cm
20 Follow up Study - Photos 50,000 After 7 Days 100,000 ppm After 7 Days Bentonite thickness increased by 2 cm Bentonite thickness no increase
21 Follow up Study - Demonstration 100,000 ppm
22 Discussion Increased conductivity levels corresponded with: A decrease in the expansion of the hydrated bentonite layer in the monitoring well The amount surface water infiltration to the well as shown by the draw down in the sample wells Follow up study: monitoring well integrity is negatively impacted by salt impacted water Establish industry best-practice when installing monitoring wells at Sites where salt impacted groundwater is suspected
23 Special Thanks: Patrick Jordan, P.Eng. Lindsay van Noortwyk, P.Ag. Ken Grykuliak, C.E.T. Oak Environmental
24 Questions
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